1、Designation:D619799(Reapproved 2011)Standard Test Method forClassifying and Counting Faults in Spun Yarns in ElectronicTests1This standard is issued under the fixed designation D6197;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,th
2、e year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the classifying and counting offaults in spun yarns using capacitance testers.1.1.1 Protr
3、uding fibers or yarn hairiness,or both,are notdetermined as part of this method.NOTE1For measuring protruding fibers or hairiness,or both,refer toGuide D5647.1.2 This test method provides for grading yarns by faultlevel and type.1.3 This test method is applicable to all single or plied spunyarns fro
4、m natural or manufactured fibers or blends of each.1.4 The values stated in SI units are to be regarded asstandard;the values in inch-pound units are provided asinformation only and are not exact equivalents.1.5 This standard does not purport to address all of thesafety concerns,if any,associated wi
5、th its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD2258 Practice for Sampling Yar
6、n for TestingD5647 Guide for Measuring Hairiness of Yarns by thePhoto-Electric Apparatus3.Terminology3.1 Definitions:3.1.1 spun yarn,nin a staple system,a continuous strandof fibers held together by some binding mechanism.3.1.2 yarn fault,nin textile strands,a change in thicknesssufficient to be vis
7、ible to the normal human eye.3.1.2.1 DiscussionIn this test method,a visible change inthickness,such as an abnormal thick or thin place in the yarnresulting in a large change in yarn diameter or any foreignmatter affixed to or spun into the yarn,such as a nep,isconsidered to be a fault.Thick faults
8、are reported as eithermajor or minor depending on the combination of length anddiameter.The most accepted criterion for major faults(infre-quent thick places)is 250 to 400%larger than yarn diameterand 20 to 40-mm(0.8 to 1.5-in.)long.The minor faults(frequent thick places)are 100 to 150%larger than y
9、arndiameter and 1.0 to 40-mm(0.04 to 1.5-in.)long.The thinplace classes are arranged and considered separately.Thecriteria for thin places may vary with manufacturers,but willgenerally fall in the category of less than 30%of diameter andgreater in length than 10 mm.3.1.3 yarn fault count,nthe number
10、 of faults per specifiedlength of product.3.1.4 For definitions of other textile terms used in thismethod,refer to Terminology D123.4.Summary of Test Method4.1 A specimen is passed through the sensing device of aclassifying instrument at a constant speed.The electroniccounting instrument records the
11、 faults and classifies themaccording to their length and relative diameter.The faults forthe most part are in the form of thick places,thin places andneps in yarns spun on various spinning systems.5.Significance and Use5.1 This test method is considered satisfactory for accep-tance testing of commer
12、cial shipments of spun yarns byagreement between purchaser and supplier.5.1.1 In case of a dispute arising from differences inreported test results when using this test method for acceptancetesting of commercial shipments,the purchaser and suppliershould conduct comparative tests to determine if the
13、re is astatistical bias between their laboratories.Competent statisticalassistance is recommended for the investigation of bias.As aminimum,the two parties should take a group of test speci-mens that are as homogenous as possible and that are from a lot1This test method is under the jurisdiction ofA
14、STM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.58 on Yarns and Fibers.Current edition approved Dec.1,2011.Published January 2012.Originallyapproved in 1999.Last previous edition approved in 2005 as D619799(2005).DOI:10.1520/D6197-99R11.2For referenced ASTM standard
15、s,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.
16、United States1 of material of the type in question.The test specimens shouldthen be randomly assigned in equal numbers to each laboratoryfor testing.The average result from the two laboratories shouldbe compared using statistical analysis and a probability levelchosen by the two parties before the testing is begun.If a biasis found,either its cause must be found and corrected or thepurchaser and the supplier must agree to interpret future testresults with consideration to the known bias.5.2 Yarn
